'operator' : integral constant overflow
The operator is used in an expression that results in an integer constant overflowing the space allocated for it. You may need to use a larger type for the constant. A signed int holds a smaller value than an unsigned int because the signed int uses one bit to represent the sign.
Example
int i = 2000000000 + 2000000000; // warning
int j = (unsigned)2000000000 + 2000000000; // OK